Screw machine



X. R. DODGE March 3, 1931.

SCREW MACHINE F l 16, 1923 11 Shets-Sheet l "4 3/; r a 772 0 (e151, ///6 SCREW MACHINE March 3, 1931. x. R. DODGE ,7

SCREW MACHINE Filed.Nov. 1a, 1923 11 Sheets-Sheet s March 3, 1931. x, DODGE 1,794,885

SCREW MACHINE Filed Nov. 16, 1923 11 Sheets-Sheet 4 X. R. DODGE SCREW MACHINE March 3, 1931.

Filed Nov. 16, 1923 11 sheets sh et 5 March 3, 1931. 'X.R.'DODGE 1,794,885

Filed Nov. 16, 1923; 11 Sheets-Sheet 6 March 3, 1931. x. R. DODGE 15794 885 v SCREW MACHINE March 3, 1931. x. R. DODGE 1,794,885

' SCREW MACHINE Filed Nov. 16, 1923 ll Sheets-Sheet 9 Q E Q U X. R. DODGE SCREW MACHINE March 3, 1931.

Filed Nov. 16, 1923 11 Shets-Sheet 10 fiZZ Zi gy/7707762 2062 e X. R. DODGE SCREW MACHINE March 3, 1931.

11 Sheets-Sheet 11 Filed Nov. 16, 1923 Patented Mar. 3, 1931 V x RAYMOND DODGE, ornmsnenn', rumors scanw MACHINE Application filed November 16, 1923. Serial No. 675,037.

As is well understood in the art with the screw machines now on the market, the stock is fed to the machine manually by the attendant, one piece at a time, and when'one piece has been passed through the machine and it becomes empty, it then operates idly until the attendant again inserts another piece of stock. The expense of having one man watch each machine sufficiently close to see that'the 10 moment one piece of stock has been utilized another is inserted would be impractical, therefore, in shops running a large number of such machines simultaneously, one attendant is usually delegated to watch or look after several machines, as a result of which the machines are running idly for a considerable portion of the time due to the inability or neglect of the attendant to manually insert additional stock into the machine as the previous pieces are exhausted. Moreover, with the present type of screw machines, after a piece of stock is manually started into the machines by the attendant it is from there on fed by a spring feed chuck and cam lever arrangement which is a constant source of trouble and calls for constant attention of the attendant, which difliculty, as 'well as the lackof the attendant to manually insertrthe stock in the machine as soon as the previous 39 one has been exhausted, materially reduces the capacity of the machine, and naturally increases the cost of the articles produced thereby. Anotherdisadvantage of the present type of machine is that the chips from the stock being 'workedon by the cutting tools rapidly accumulate requiring the attention of the attendant to keep it clean and requires consant removal the attendant in order to prevent jamming of the machine. It is therefore, an object of my invention to provide a screw machine -which will overcome these disadvantages. g

It is a further object to provide a machine in which the stock is fed therethrough'by frictional gravity thus entirely eliminating the old troublesome spring fed chuck and cam lever or its equivalent.

It is a further object of my invention to provide a machine in which the spring, tools and slides are self cleaning without the attention of the attendant and thus-prevent all likelihood of the machine jamming, which frequently occurs with the machines now on the market owing to the failure of the .at-

tendant to remove the accumulations.

It is a further object of my invention to provide new and improved means, for adjusting the cutting tools and for'brin'ging the tools to and from the work or stock operated on.

It is a further object to provide new and improved meansfor readily and quickly putting the-machine inorder upon the completion of the operation of the cutting tools.

A further object is to provide newv and improved means for readily-adjusting or timing onemechanism with respect to another for the diiferent operations. h a

It is a further object of my invention to provide a machine of this type with a magazine which canbe loaded with a number of separate pieces of stock at one time and-re loaded while the machine is still operating and the pieces of stock automatically :Eed therefrom without an attendant into the machine successively and continuously with out interruption.

It is a further object of my invention to greatly increase .the capacity of screw ma- I chines. v r 1 The above and other features of novelty, advantages and capabilities, will become apparent from a detailed description of the accompanying drawings in which I have illustrated one form of my invention; but the construction there shown will be understood as illustrative onlyand not as defining the limits of my invention. V Fig. 1 is a s1de elevatlonal view ofa screw machme embodying one form of my invention, with a portion of the feedmagazine broken away. 7 I

i Fig. 2is a top plan view of the same.

Fig. 3 is anenol elevational view showing the feed magazine in section and taken substantially on the line 33 of Fig. 1, looking in the direction indicated by the arrows.

Fig.4is a sectional view taken substantial- 1y on the line44 of Fig. 3. I

Fig. 5 .is an end elevational view of the ice I cone pulley taken on the line 5 of Fig. 4:. Fig. 6 is an end view of the clutch which cooperates with the cone pulley showing the pawl for engaging with the ratchet on the cone pulley.

Fig. 7 is a horizontal sectional fragmentary View taken on the line 7-7 of Fig. 6.

Fig. 8 is a view taken on the line 8 8 of Fig. 4. V

Fig. 9 is an enlarged elevationalfside view of the trip and locking lever shown in' Fig. 8 for cooperating with the clutch, to throw the cam shaft into high speed.

Fig. 10 is a similar view of the same with the parts in slightly different position to lock the trip lever. 1

- Fig. 11 is an enlarged elevational View partially in section of the automatic feed mechanism showing a portion of the feed magazine broken away.

Fig. 12 is an end view of the structure shown in Fig. 11 looking in the direction indicated by the arrows.

Fig. 13 is a view taken on the line'13-13 of Fig. 12.

Fig. 1 1 is a view taken on the line 1%14 of Fig. 12. e

Fig. 15 is a view takenon the line 1515 of Fig. 14: showing in dotted lines the pulley wheel and the pins thereon to the left of the line. I

Fig. 16 is a view taken on the line l616 of Fig. 14.

Fig. 17 is a viewtaken on the. line 17-17 of Fig. 16.

Fig. 18 is a sectional view of the feed magazine.

Fig. 19 is a plan view of the structure shown in Fig. 18 with a portion broken away.

Fig. 20 is an elevational view of the head plate for the magazine through which the stock is fed. 7

Fig. 21 is alongitudinal sectional view of the spindle taken on the line 21-21 of Figure 2. V

Fig. 22 is an end view of the spindle proper.

Fig. 23 is an enlarged detailed view of the.

cutting tool partially in section.

Fig. 24. is a sectional view on the line 24 -2 1.- of Fig. 23 and,

Fig. 25 is a face view of the cams shown in Figs. 23 and 24. p

Referring to the drawings in detail. the bed 10 of the machine is arranged at a substantial angle supported at its lower or as. ward end by a suitable base 11 and at its rear or elevated end by a satisfactory standard 12. In the embodiment shown, the bed is arranged at approximatelya 40 degree angle and I have found after experimenting for a long period of time that the best results are obtained by having the stock pass through the spindle and cutting tools at about that angle. However, I have ob- Me issa tained satisfactory results at various angles from 15 to about degrees.

Suitably mounted on the bed 10, near the upper end thereof and at right angles thereto is a tool feed shaft 13 on which is non rotatably mounted a taper clutch l l having an integral sleeve 15 as best shown'in Figure 4. Rotatably mounted on this sleeve is a cone pulley 16, the inner face of this pulley being provided with ratchet teeth 17, as best shown in Fig; 5. ries a pivotally mounted spring pressed pawl 18 designed to engage the ratchet teeth 17 causing the clutch 14 to operate with the pulley 16 when the'latter is moving in a clockwise direction. The pulley .16 is driven by means of a belt or the like from a suitable source ofpower, (not shown) and is provided with stepped grooves so that the speed thereof may be readily changed by shifting the driving belt from one groove to another. The shaft 13 is provided with a suitable slidable clutch 18jwhich is operated by the lever 18 by throwing such clutch into engagement with the ratchet collar 19 fast to the sleeve 15. It is to be understood that the clutch l l is non-rotatably mounted on the shaft 13 in any satisfactory manner so t at said shaft is caused to rotate with the clutch Near the opposite end of the shaft 13 is a non-rotatably mounted worm 20 which wormis constantly in mesh with a worm gear 21 non-rotatably mounted on the cam shaft This cam shaft is positioned parallel with the bed 10, and rotatably mounted in suitable brackets supported by the bed 10. Non-rotatably mounted on the forward end of the cam shaft 22 is a tail spinole cam' drum 23 for operating an adjustable tail spindle head 2 and stock shaft 25 which carries the stock gage 26. The op eration and construction of the stock shaft and adjustable tail spindle head may be of any well known form and being wellunderstood in the 'art a further description of these. particular parts is believed unnecessary, with the exception of the means for adjusting the cam on the drum for the purpose of timing the parts operated thereby which will be referred to later.

The spindle 2'? (see Figure 21) is rotatably 'mounted in the housing 21 supported on suit-able brackets 28 on the bed 10. Within the spindle is a friction tube 29, which, by means of the bracket 30secured to the bed The clutch 14: car-' 10 is held against rotation. The stock operated on passes down through this tube by gravity, but gradually and not abruptly, due to the friction of the stock the inner sur-' face of the tube. This tube, it will be noted terminates short of the lower end of the spindle. The spindle is operated constantly while the machineis'being used through the 'beltwhe'el which wheel is operatively connected by. means of a belt or the ii is with any the dilferent operations. The means for grip-.

ping the stock as best shown in Figs.'21 and 22 consists of a spring chuck 32 preferably constructed I of three longitudinal are shaped members 33 having their inner ends screw threaded into the chuck 34;. Near the forward end of the spindle there is mounted between the spring chuck and the outer casing of the spindle a chuck sleeve 35'having'. its

inner. outer edge beveled and adapted to co operate with the outer beveled surface of the spring chuck 2-32. By sliding this chuck sleeve downwardly or to the right as appears in Fig. 21, the beveled surface'thereof slidingly engages the beveled surface of t ie spring-chuck and causes it to contract and tightly grip the stock making it rotate therewith. F or movdesired to grip the stock, I ha-vemounted in suitable slots in the casing of the spindle, a pair of chuck fingers 3,6, which fingers at their downward ends are provided with suitable shoulders 37 adapted to engage the inner end of the chuck sleeve 35. These fingers are also provided at their downward ends with outwardly extending portions having a ball and socket connection with the collar 38, vwhich collar can be readily adjusted on the spindle by means of the adjusting-nut 39. The upper ends of the fingers 36 extend outwardly into engagement with theinner surface of the chuck wedge or collar 40. The collar 40 is provided with a peripheral groove with which there is designed to cooperate a bifurcated lever 41, asbestshown in Figsrl and 2, having suitable pins or rollers adapted to enter the peripheral groove in the collar 4:0. This lever is fastened to a rock shaft 42,

(Figure 21) mounted in a suitable bracket on the bed 10. The inner bifurcated arm is provided with a pin l-S having thereon 'a roller 44. For rocking this arm and causing the collar 40 to slide backand forth, I have provided a chuck drum 15 which is "nonrotatably mounted on the cam shaft 22 and provided with a cam surfa oe l6 adapted when in operation to engage the, roller la The the upper ends of which are parallelwith the axis of the spindle. Secured to the tool heads are suitable cuttmg or shaping tools, such for example, as the tools 48 and 49 as shown in Fig. 23.3.], 1 ,1 .1 a

I have provided means whereby one tool can be set orfadjusted independentlyof the other. For". accomplishing this I have mounted a drum 50 on the cam shaft 22, on

owhichdrum are mounted: cams 51 and 52.

These cams are provided'with V,,shaped circular grooves adapted to receive the V shaped tongues (being .best'shown in Fig. 24) on the disk 53 bymeans of which they areisecured in place by any satisfactory means such as bolts and nuts shown. Rigidly secured to one of the tool heads 47, is a bell cra-nk'arm 54'which is provided at its free end with a suitable bracket 55. carrying a roller 56 adapted toicooperate with the cam "52'while the othertool head carries abell crank arm 57 having atitsfree en'da similar bracket and roller adapted to cooperate with the cam 51. The-heads 47 are normally pressed apart by the compression springs 58 mounted on thebolt 59 passing through the lugs 60 formed-integrally with the heads l7;

With the cam-arrangement as just described and as clearly illustrated in Fig. 24:, it will be seen that either cam can be readily and quickly adjusted at any desired position so that either head and the tool carried thereby maybe set, adjusted and timed for operation independently of'the other, byisimply changing the position of the earns 51 and 52 with respect to the drum 50.

When the tools are operating on a piece of stock it is necessary that thecam shaft be travelling ata comparatively low speed, but the moment such operation is completed it isextremely important in order to speed up the capacity ofthe machinethat the cam shaft travelat a comparatively high rate of the next operation. Therefore, I have pro- V vided improved means for accomplishing this result, which means I will now describe.

, Rotatably mounted on the shaft 13 is a slideable sleeve 61 having a reduced end.

Secure-d thereon by means of a screw threaded nut 63 is a race 62. Mounted in the race on ball bearings is a collar 64:. The opposite end of the sleeve 61vhas keyed thereto I a clutch pulley 65 which pulley is geared or connected to a source of power (not shown)", in a manner to causeit to rotate at a considerably greater speed than the pulley 16 the cutting tools'have completed one operationvto quickly re-set the parts and back'again into low speed the moment the tools are ready for the next operation, I have provided improved means which can be readily and quickly adjusted and timed for this purpose, to which I will now refer. e

Mounted on the cam shaft22 near its up per end is. a disk: wheel 66. This wheel is provided with two circular grooves 67 each having a. circular opening 68 carrying a screw threaded lug 69. Each lug has secured thereto by means of a nut or the like suitable trips 70 and 71 extending slightly beyond the periphery of the wheel 66 as best seen in Fig. 8. Referring to the same figure, there is mounted on the frame of the machine by any suitable means, a bracket 7 2 provided with aligned bearings. In these bearings is mounteda shaft 7 3having fixed thereto a member 74 with two upwardly outwardly curved arms 75 provided with screw threaded pins 7 6 near their upper'ends adaptedto engage the collar 64:. (Fig. 4.) The bracket 72 (Fig. 8) is at its upper outer end provided with bifurcated arms 7 6? having aligned openings in which is pivotally mounted a locking lever 77. This locking lever at its free end is provided with a beveled pin 78 adapted to be engaged by the trip 7 0 on the wheel'66. The member 7 2 has an outwardly extending spring supporting arm terminating in a comparatively wide fiat extension 79 which is provided with a pair of screw threaded openings. One of the arms 7 5 is integrally provided with an outwardly extending bell crank 81. This bell crank is provided with a pin near its-outer end adapted to be engaged by the trip 71 on the wheel 66. Mounted between the outer end of the bell crank 81 and the spring supporting arm 79 are compression springs 80, both of which are adjustable by means of the screws 82 to increase or diminish the effective force of such springs. The pins near the outer ends of the locking lever 77 and bell crank 81 are readily adjustable by means of the set screws 82 as shown. In Fig. 9 the locking lever 77 and bell crank 81 are shown in their normal posi tion, that is when in that position the high speed clutch 65 is out of operative engagement with the clutch 1i. As the disk wheel 66 revolves the trip 70 engages the pin on the locking lever 77 (it willbe understood that this trip is so adjusted on the wheel 66 as to come into engagement with the pin on the locking lever 77 the moment the cutting tools have completed their operations) and forces the locking lever 77 to swing downwardly. In so doing thequarter round pin 88 on the lever 77 which'is in engagement with a similarpin 8% on the bell crank 81 ecomes disengagec due to the different arcrdescribed by. each, thus unlocking the bell crank 81, whereupon the inner compression spring throws the free end of the bell crank upward causing the arms 75to swing. about their pivot and the collar64 forcing the pulley 65 through the sleeve 61 into operative engagement with the clutch it. Then when the trip 71 on thewheel being moved downwardly the-pin ea describes an are which permits the pin 83 to move upwardly to locking position as shown in Fig.

I will now describe the stock magazine and the timing mechanism for automatically operating the magazine and for feeding the stock therein contained continuously and suc cessively into the spindle. comprises a plurality of long parallel tubes 85 constituting barrels. In the embodiment shown they are positioned at the same angle asthe spindle of the machine. The upper ends of the barrels 85 are mounted in and pass through a disk 86 which disk is rotatably mounted in a head 87. The head 87 is supported in the desired position by any suitable frame-work (not shown) The opposite ends of the barrels 85 are mounted in suitable openings in the gear wheel 88. This gear wheel as well as the disk 86 are non-rotatably mounted on a shaft 89. The inner or lower end of said shaft is suitably mounted in thefhead piece 90. The head piece in turn is suitably supported by the bed or frame of the machine.

rels until checked by the head piece 90. The

entire magazine is revolved slowly by the shaft 93 which is provided wlth gear teeth The magazine designed to mesh with the gear 88. As the 7 magazine is rotated the stock or rather the lower ends thereof, are caused to ride up on and past the are shaped cam 92. The moment a piece of stock reaches the blfurcated' end of the cam it starts on its downward travel.

through the receiving opening in the head piece into. the spindle. Further rotation of means hereinafter described until the entire supply in one barrel has passed therethrough.

Secured to the head 90 is a bracket 94 which bracket and head are provided with aligned hearings in which bearings is mounted the shaft 98. Rotatably mounted on this shaft on the lower side of the head 90'is a driving pulley 95 which pulley is operatively'connested by a suitable belt 96 toa pulley 97 non-rotatably mounted on the cam shaft 22 as best shown in igs. 2 and 8.

Mounted on the bracket 94 by any suitable means, is a cylindrical cup shaped casing 98, which casing is provided at its upper surface with a slot or groove 99 parallel with the axisthereof. (See Fig. 13;) Keyed to the shaft 93 within this cup. shaped casing is-a disk 100 havinga transverse slot or groove in which slotis pivotally mounted a dog 101 by means of the pin 102. This dog when thrown outwardly by means presently to be described, is adapted to registerwith the pins 103 fast to the inner surface of the pulley 95,

so that when the dog is thrown out into the path of these pins the pulley 95 which is constantly rotating when the machine is in oporation, rotates the magazinethrough the gear 88, shaft 93 and disk 100. The dog 101 is provided with an upwardly extending pin 104 (see Figures16 and 17), adapted to register with, and travel in the annular groove I 105 formed the casing surrounding the disk. Mounted on the casingis an upwardly extending bracket 106 in which bracket is rigidly fixed a sleeve 10'? (see Figures 11 and 12). In this sleeve is rotatably mounted a rock shaft 108. Rigidlyfixed to one endof this rock shaft, is a bifurcated arm or: lever 109 so positioned as to be rocked or moved inwardly by the flanged sleeve 1:10, slideably mounted in the stock receiving opening 91 of the head 90. The stock onits travel. to the spindle passes throughthe sleeve 110thence than the stock so that when the outer end of the stock leaves the barrel 85 the follower, which operates by gravity moves downwardly and engages the outer end of thesleeve 110 moving it inwardly thus rocking thebioperation.

furcatedarm109. Fast tothe opposite end of the rock shaft108 is a trip lever 112 the freeend thereof being .adapted to swing in the transverse slot of the casing: Pivotally connected to this lever,.intermediate its ends (see Figure 14), is a link 113. The free end of this link is off-set so as to be directly in linewith, and in the path of the free end of the lever 112. Thus, when the lever 112 is thrown outwardly by the meansheretofore described, it strikes the link 113, whichin turn engages the pin 104 onthe dog throwing the latter outwardly into the path ofthepins on the pulley 95. l

The moment the follower 111 moves'out 'of contact withthe sleeve 110 as the inagazine rotates, the tension springnll l automatically returns the sleeve and itscooperating levers to their normal position ready for thenext The relation of the gearing and spacing of the tubes in the magazine is such that the disk 100 makes one revolution from the time For sliding the, sleeve inwardly. to.

the follower engages the sleeve and the neXt tube is brought into registration with the sleeve. at which moment it .is necessary to antomatically throw the means for rotating the magazine out of engagement which means I will now describe.

Pivotally mounted on the casingis a lever 115 adapted to swingin the transverseslot'of the casing. I providedon its under side with a beveledcam groove 116 (see Fig. 17). This cam is adapted to be engaged by'the pin 104 on the dog,

as a result this pinin riding over the cam I throws the dog into the position shown in dotted lines (Fig. 14:) thus throwing the disk 100 out of driving relation withthe pulley 95.

In order to reset or return the lever 115 to its normal position after the 'pinhas' passed spring 117 which is suitably connected at one end to the casing and at its oppositeend to the lever-as best shown in Fig. 13. To limit This lever near its free end is a the cam thereon, I have. provided a tension the outward throw of the link'113, I have 1 provided a stop pin 118 mounted in the transverse slot of the casing I (see Fig. 13). For

holding the disk in frictional registratioir with the casing and against accidental rotatlon, I have provided 1n the casing a spring pressed pin 119 havinga beveled endadapted to cooperate with abeveled notch on the in- .ner surface of the disk.

If for any reason the tension spring 11 1- should fail to function I have provided a cam 120 onathedisk adapted to engage the lower end of the link 113 and return it to its normal position. I

For limiting the inward throw of the sleeve" by the follower 11-1 to the thickness of the bifurcated end of the cam race .92 I have provided a stop 121 secured by, means of a bolt or the like to the head piece 90'.

From the foregoing description it will be seen that I have provided a machinewhich possesses to the fullest extent all of the features heretofore pointed outas well as many other'inherent advantages. a e 1 Assuming the parts are assembled as described and-illustrated the operation briefly is as follows:

The various barrels of the magazine are filled with stock, one of which barrels is brought into registration with the receiving opening in. the head 90 and thence feeds atan angle of about 10 degrees by'frictional gravity down through the frictional stationary tube mounted in the spindle until the lower end of the stock engages the stock gauge 26 on the stock shaft 25.; Assuming alsothat the machine is inoperation and the various parts are timed and are in step with. one another and that the spindle has gripped the stock and the cutting tools 47 are working on that portion of the stock extendingbeyond the spindle the parts are so timed that the rollers carried by the bell-crank arms of the tool heads leave their'respective cams the tools to work on.

moment the tooling operation is completed, whereupon the tools are thrown to open or idle position by the compression springs 58. Immediately upon completion of the tooling operation the trip 70 on the wheel 66 carried. by the cam shaft 22 releases the locking lever 77, whereupon the shaft 13 is thrown into operative connection with the high speed driving pulley 65, which, through the connections theretofore described, causes the cam shaft to operate at high speed for resetting the machine. lVhile the machine is operating at high speed the drum 45 through its cams throws the collar 40 back and forth for releasing and reestablishing the grip of the spindle. During the slight interval between the releasing and reestablishing ofthe' grip of the spindle the stock gradually feeds by frictional gravity down the tube within the spindle, presenting a new section of stock for the Immediately thereupon the cams for oaeratin the tool heads are so positioned as to bring the tools into cutting action with the portion-of the stock extending beyond the spindle. The instant the tools are again brought into contact with the stock the trip 71 on the wheel 66 is so timed as to force the bell crank 81 downwardly, releasing the pulley 65 from the clutchl and thereby disconnecting the cam shaft from the high speed. pulley and permitting itto return to low speed until the rollers carried by the arms on the tool heads again pass their respective cams, whereupon the high speed or reseating operation is again repeated.

While the foregoing operation is taking place the stock magazine delivers or feeds to the machine the various separate pieces in continuous succession, much'in the same manner as though they were one long piece. The magazine is driven from. a wheel on the cam shaft by means of an idler mounted on the shaft 93. This idler is thrown into and out of driving relation with a disk mounted on the shaft 98 by means of a. pawl arrangement This pawl is thrown into driving relation by engagement of the follower in the barrels of the magazine with the slid'able sleeve 91 which in turn kicks or engages the lever 109 for throwing the pawl out of and into driving'relation, which pawl is on each revolution returned to its normal position by means of the cam arrangement heretofore described.

Having thus described my invention, I claim:

1. In a screw machine, a plurality of stock retaining means, a frictionally controlled gravity feeding means for the stock, a stock follower slidable in one said retaining means, and means actuated by said follower for registering the next succeeding retainin means with said stock feeding means.

2. In a screw machine a feeding magazine comprising a plurality of stock retaining means, a follower slidable in one of said retaining means, a tool, frictionally controlled gravity feeding means for feeding the stock to said tool, means actuated by said follower for successively registering each said retaining means with said feeding means, the stock being fed from said retaining means into said feeding means by gravity.

3. In a variable speed driving mechanism, a trip member, means for moving said trip member, a low speed and a high speed driving means operatively connectable with the trip moving means, and means including a locking lever actuated by said trip member for operatively connecting said high speed 1 driving means to said trip moving means. 4. In a varla-ble speed drlving mechanism, a trip member, means for moving sald trip necting said high speed driving means from said trip moving means.

5. In a variable speed driving mechanism, a trip member, means for moving said member, a low speed driving means including a locking lever normally operatively connected with said trip moving means, and means actuated by said trip member for disconnect: ing said low speed driving means from said trip moving means. i

6. In a screw machine, comprising head provided with a stock receiving opening, a slideable bushing mounted in said opening through which the stock is adapted to pass, a magazinecomprising a plurality of barrels adapted to successively register with said bushing, means for driving said magazine, a clutch mechanismadapted to be operated by the inward movement of said bushing, and a follower in said barrels for engaging and moving said bushinginwardly for the pur pose set forth.

. 7. In a screw machine, the combination of a head havlng a stock lntake opemng,a magazine comprising a plurality of barrels adapted to. successivelyregister with said intake opening, means for rotating said magazine and a beveled cam race terminating at said intake opening for the purpose set forth.

8. In a screw machine, the combination of a head provided with'a stock receiving opening, a rotatable magazine provided with a plurality of barrels adapted to successively register with said opening, a follower in said barrels, a gear on said magazine, a shaft con nected with said gear, a driving wheel loosely mounted on said shaft, a casing, a member within said casing and rotatable with said shaft, a dog pivotally mounted in said member,

ceiving opening, for the purpose set forth.

9Q In a device oft-he class described, a driving and clutch mechanism comprising in combination, a shaft, a dl'lVlllg member rotatably mounted thereon, a casing, a disk non-rotatably mounted on said shaft within the casing, a dog pivotally mounted in said disk and adapted to be thrown into driving relation with said driving member, a pin carried by said dog and a cam lever adapted to co-operate with said pin for disengaging said dog upon the completion of one revolution of said disk, for

the purpose set forth.

10. In a variable speed driving mechanism, comprising in combination a driving shaft, a clutch on said shaft, a driving member on one side of said clutch, an independent driving member on the opposite side of said clutch, a spring actuated rocking arm connected with said independent driving member for operating said clutch, a locking lever for saidrocking arm, a driven member, and means operated by said driven member for releasing said rocking arm and returning it to locked position, substantially as set forth.

11. In a screw machine, the combination of a cam shaft, pivotally mounted tool heads adjacent thereto, each provided with offset integral arms, independently adjustable cams on said shaft and adapted through suitable connections to rock said arms for the-purpose set forth.

12. In a screw machine, a cam shaft in combination with means for operating the tool heads, said means comprising a drum fastened to the cam shaft, a pair of independent and readily adjustable cams provided with annular grooves and a pair of disks provided with tongues adapted to co-operate with said grooves, and means for readily securing said disks, cams and drum together, for the pur pose set forth.

13. In a screw machine a cam shaft, a p1u-- rality of cams each having a circular hole therethrough for concentric mounting on said shaft, concentric grooves on said cams, and means rigidly connected to said shaft and projecting into said grooves for locking said cams in a plurality of positions.

14. In a. screw machine, comprising a bed positioned at a substantial angle, a rotatable spindle mounted thereon and parallel with saidbed, and a non-rotatable frictional feed tube mounted in said spindle, substantially as and for the purpose set forth.

' 15. In a variable speed mechanism, a rotatable shaft, a clutch non-rotatably mounted on for throwing saiddriving member into drivsaid shaft, a driving wheel rotatable relatively to said clutch, means for engaging said wheel and clutch, said means automatically operating when the wheel rotates relative-lyto the clutch in one direction, and a second driving wheel rotatable relatively to the clutch and movable longitudinally into operative engagementwith the clutch. V

16. In a variable speed'mechanism, a re 'ta-table shaft, a clutch non-rotatably mounted on said shaft, a driving wheel rotatable rela-.

tively to said" clutch, means for engaging said wheel and clutch, said means automatically to the clutch inione direction, and a second driving wheel rotatable relatively to the clutch, and-meansfonmoving the second. wheel longitudinally into operative engagement with said clutch. V v. v

17;In a device of theclass described,a driving shaft, a driving clutch forfsaid shaft, a driving member for said clutch, a bell'orank operatively connected with said driving member, means cooperating with said bell crank ing relation with said clutch, a locking lever cooperating with said bell crank for holding operating when the wheel rotates relatively said driving member out'of driving relation 7 with said clutch, and means for automatically releasing said bell crank and returning it to its locked position. i 1 i I i 18. In a screw machine, the combination of a rotatable spindle mounted therein, and a non-rotatable tube mounted in said spindle for feeding stock operated on, substantially as and for the'purpose set forth.

19. In a variable speed mechanism, a driving shaft, a driving clutch for said shaft, a driving member for said clutch, a pivoted element for moving said driving member,means cooperating with said element for throwing said driving member into driving relation 7 with said clutch, a locking lever cooperating with said pivoted element for locking said element and for holding said driving member out of driving relation with said clutch, and means for automatically'releasing said element and returning it to its locked position. v

20. In an adjustable cam mechanism, a shaft, a cam, a supporting member for centering the cam about a shaft, and means for rigidly retaining'the cam on said member, said means comprising a groove in said cam and a disk provided with a tongue fitting in said groove. I

21. In a clutch mechanism, the combination of a rocking arm provided with a locking pin, a locking lever arranged in a parallel plane and provided with a pin adapted to mesh with the pin on the rocking arm for holding said arm in locked position and means for releasing said arm and returning it to locked position.

22. In a clutch mechanism, the combina tion of arocking arm spring actuated in one direction, a locking lever adapted to connect with said arm for holding in locked position and means for releasing said armand returning it to locked position.

23. In an adjustable cam mechanism, a movable shaft, a cam supporting member non-rotatably mounted on said shaft, a cam rotatably mounted on said member, and means for rigidly retaining the 0am on said member said means comprising an annular V groove in said cam and a tongue fitting in said groove.

24. In an adjustable cam mechanism, a shaft, a cam, a supporting member for centering the cam about the shaft, and means for rigidly retaining the cam on said member in any position relative to a fixed diameter of the shaft, said means comprising a groove in said 7 cam. and a disk provlded with a tongue fitting in said groove.

25. In an adjustable cam mechanism, a movable shaft, a cam supporting member hon-rotatably mounted on said shaft, a'cam rotatably mounted on said member, and

means for rigidly retaining the cam on said member in any position relative to a fixed diameter of the shaft, sald means comprising a groove in said cam and adiso provided With a tongue fitting in said groove.

In Witness whereof, I have hereunto subscribed my name to this specification.

X RAYMOND DODGE.

GERTlFIGATE 0F CORRECTION.

Patent No. 1,794,885. Granted March 3, 1931, to

X RAYMOND DODGE.

It is hereby certified that error appears in me printed opeciiication of the above numberexi patent requiring correction as ioilows: Page 6 lines 96 and 97, claim 5, strike out the words "inoiudiog a locking levei" and insert the some before the word actuate i" in line 39 of same claim; and than the said Letters Patent should be read with this correction heroin that the. same may conform to the record of the case in ihe Patent Uiffioo.

Signed and sealed this 5th day of May, A. 2). I931.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

